This combined filter chain is sorted by the org.springframework.core.Ordered interface, which you can set by implementing the getOrder() method. The Gateway is defined with a number of routes, each with Predicates to match the request to the route. The resulting response is similar to the following: The response contains the details of the global filters that are in place. The following example configures a weight route predicate: This route would forward ~80% of traffic to weighthigh.org and ~20% of traffic to weighlow.org. Zuul profile. You can use the ModifyRequestBody filter to modify the request body before it is sent downstream by the gateway. There should be no reason why a filter cannot modify a response header. The following example configures a RemoveRequestParameter GatewayFilter: This will remove the red parameter before it is sent downstream. SetResponseHeader is aware of URI variables used to match a path or host. By default, the RemoteAddr route predicate factory uses the remote address from the incoming request. Add a Header for the original response, configuration example: spring: cloud: gateway: routes: - id: add_response_header_route uri: https://example.org filters: - AddResponseHeader=X-Response-Foo, Bar. essentially skipping the filter. The Between route predicate factory takes two parameters, datetime1 and datetime2 Spring Cloud has it's own way of defining Feign clients, it's done with Spring MVC annotations. The AddRequestHeader GatewayFilter factory takes a name and value parameter. The following table describes the structure of each element (each is a route) of the response: The GatewayFilter factories applied to the route. The following listing configures a Retry GatewayFilter: A simplified "shortcut" notation can be added with a single status and method. This filter takes an optional keyResolver parameter and parameters specific to the rate limiter (described later in this section). I think i have to go for a blocking call here. Standard policies to change default 3scale APIcast behavior 3scale provides built-in, standard policies that are units of functionality that modify how APIcast processes requests and responses. the ID of the service from the DiscoveryClient. Usually it's a common requirement that applications can . Currently, only forward: schemed URIs are supported. The reason the filters are divided by the dotted line is that filters can run logic both before and after the proxy request is sent. spring.cloud.gateway.filter.local-response-cache.timeToLive Sets the time to expire a cache entry (expressed in s for seconds, m for minutes, and h for hours). The following loggers may contain valuable troubleshooting information at the DEBUG and TRACE levels: org.springframework.boot.autoconfigure.web. httpStatusCode: The HTTP Status of the request returned to the client. if you intend to modify a JSON response body prior to returning to the client, the above gist will not work (i know because i tried). The following example configures an SetResponseHeader GatewayFilter that uses a variable: The SetStatus GatewayFilter factory takes a single parameter, status. The following two examples are equivalent: For some usages of the gateway, properties are adequate, but some production use cases benefit from loading configuration from an external source, such as a database. This handler runs the request through a filter chain that is specific to the request. Spring Cloud Gateway requires the Netty runtime provided by Spring Boot and Spring Webflux. Configuring Predicates and Filters For, 15.4. .build(); The name and argument names are listed as code in the first sentence or two of each section. In future milestone releases, there will be some KeyResolver implementations. The default list of headers that is removed comes from the IETF. Creating of individual headers can be controlled by the following boolean properties (defaults to true): spring.cloud.gateway.x-forwarded.for-enabled, spring.cloud.gateway.x-forwarded.host-enabled, spring.cloud.gateway.x-forwarded.port-enabled, spring.cloud.gateway.x-forwarded.proto-enabled, spring.cloud.gateway.x-forwarded.prefix-enabled. If it is not provided, the value of the Host request header is used. For a production deployment, you can configure the gateway with a set of known certificates that it can trust with the following configuration: If the Spring Cloud Gateway is not provisioned with trusted certificates, the default trust store is used (which you can override by setting the javax.net.ssl.trustStore system property). Those values are then available for use by GatewayFilter factories. See the documentation for @RequestMapping in Spring MVC for more details of those features. This is the number of tokens the token bucket can hold. The RequestHeaderSize GatewayFilter factory takes maxSize and errorHeaderName parameters. Want to remove the "warning cannot modify header information" error from your WordPress website? also note that the gist doesn't take the decoders into account from upstream like here. The following listing configures a websocket routing filter: After the gateway has routed a ServerWebExchange, it marks that exchange as routed by adding gatewayAlreadyRouted In Puma (RubyGem) before 4.3.3 and 3.12.4, if an application using Puma allows untrusted input in an early-hints header, an attacker can use a carriage return character to end the header and inject malicious content, such as additional headers or an entirely new response body. The algorithm used is the Token Bucket Algorithm. For the external controller/handler scenario, headers can be added with exception details. The Forwarded Headers Filter creates a Forwarded header to send to the downstream service. The following example configures an AddRequestHeader GatewayFilter that uses a variable: The AddRequestHeadersIfNotPresent GatewayFilter factory takes a collection of name and value pairs separated by colon. }) It is possible to create a gateway filter named without the. To create a route, make a POST request to /gateway/routes/{id_route_to_create} with a JSON body that specifies the fields of the route (see Retrieving Information about a Particular Route). This project provides an API Gateway built on top of the Spring Ecosystem, including: Spring 6, Spring Boot 3 and Project Reactor. As Spring Cloud Gateway distinguishes between pre and post phases for filter logic execution (see How it Works), the filter with the highest precedence is the first in the pre-phase and the last in the post-phase. This predicate extracts the URI template variables (such as segment, defined in the preceding example) as a map of names and values and places it in the ServerWebExchange.getAttributes() with a key defined in ServerWebExchangeUtils.URI_TEMPLATE_VARIABLES_ATTRIBUTE. per-route http timeouts configuration via configuration, per-route timeouts configuration using Java DSL, Example 73. The following example configures a PrefixPath GatewayFilter: This prefixes /mypath to the path of all matching requests. SpringCloud Gateway After Before Between Cookie Header Host Method Path Query RemoteAddr Weight 5.1 Path spring: application: name: gateway-server cloud: gateway: routes: - id: aaa uri: http://localhost:8001 predicates: - Path=/product/** - id: bbb uri: http://localhost:8002 predicates: - Path=/order/** 5.2 Query The following maxTrustedIndex values yield the following remote addresses: (invalid, IllegalArgumentException during initialization). 25Modify Response Body GatewayFilter Factory; The previous sample defines the Cookie Route Predicate Factory with two arguments, the cookie name, mycookie and the value to match mycookievalue. Raw. Both offer the same possibilities. Spring Cloud Gateway Response Modification Raw README.md Overview As of this writing, there's a somewhat limited/restrictive means of applying HTTP response transformations/modifications via Spring Cloud Gateway, probably because it needs to accommodate both the Mono and Flux (aka "reactive") models. #{@myRateLimiter} is a SpEL expression that references a bean with named myRateLimiter. You can customize the way that the remote address is resolved by setting a custom RemoteAddressResolver. as the separator. To delete a route, make a DELETE request to /gateway/routes/{id_route_to_delete}. The following listing configures a RemoveRequestHeader GatewayFilter: This removes the X-Request-Foo header before it is sent downstream. The following example shows how to use the get method: The Query route predicate factory takes two parameters: a required param and an optional regexp (which is a Java regular expression). application.yml. The RemoveRequestHeader GatewayFilter factory takes a name parameter. #{@myKeyResolver} is a SpEL expression that references a bean named myKeyResolver. The header is added to the response if configured with the following property: The StripPrefix GatewayFilter factory takes one parameter, parts. There are many caching cases on the network, but there are various Bug problems in the testing process. The default request size is set to five MB if not provided as a filter argument in the route definition. Download ZIP. By default, it creates a NettyChannel by using the default TrustManagerFactory. Any otherway is there apart from blocking call? If max-age is present on the original response, the value is rewritten with the number of seconds set in the timeToLive configuration parameter. This predicates matches the Host header that matches the pattern. The circuit breaker config object takes a list of If you would like us to look at this issue, please provide the requested information. URI variables may be used in the value and are expanded at runtime. response-timeout must be specified as a java.time.Duration. To retrieve the GatewayFilter factories applied to routes, make a GET request to /actuator/gateway/routefilters. For example, to reference a filter named Something in configuration files, the filter The url parameter should be a valid URL. The default implementation of KeyResolver is the PrincipalNameKeyResolver, which retrieves the Principal from the ServerWebExchange and calls Principal.getName(). The XForwarded Remote Addr route predicate factory takes a list (min size 1) of sources, which are CIDR-notation (IPv4 or IPv6) strings, such as 192.168.0.1/16 (where 192.168.0.1 is an IP address and 16 is a subnet mask). To provide the same CORS configuration to requests that are not handled by some gateway route predicate, set the spring.cloud.gateway.globalcors.add-to-simple-url-handler-mapping property to true. response Header Transformations: . The following example configures a MapRequestHeader: This adds the X-Request-Red: header to the downstream request with updated values from the incoming HTTP requests Blue header. If You Appreciate This, You Can Consider: We are thankful for your never ending support. Route filters allow the modification of the incoming HTTP request or outgoing HTTP response in some manner. Configuring Route Predicate Factories and Gateway Filter Factories, 5.10. 1. To remove any kind of sensitive header, you should configure this filter for any routes for which you may want to do so. Likewise to the RedisRateLimiter Filter Factory it requires the use of the spring-boot-starter-data-redis-reactive Spring Boot starter. It uses the Netty HttpClient to make the downstream proxy request. forwards the incoming token to outgoing resource requests. Setting this value to zero blocks all requests. The following examples show how to set up global pre- and post-filters, respectively: Spring Cloud Gateway provides a utility object called ProxyExchange. In the example below the call consumingServiceEndpoint/users/1 will be redirected to inCaseOfFailureUseThis/users/1. .application.yml. Since the request can be read only once, we need to cache the request body. However, there is one in another application, registered under localhost:9994. The Spring Cloud Gateway project is built on top of the popular Spring Boot 2 and Project Reactor, so it inherits its main treats: Low resource usage, thanks to its reactive nature Support for all goodies from the Spring Cloud ecosystem (discovery, configuration, etc.) SetRequestHeader is aware of URI variables used to match a path or host. to the exchange attributes. The redis-rate-limiter.requestedTokens property is how many tokens a request costs. For example, you can match on the path segment of the URL or the HTTP method of the request. This is similar to how AddRequestHeader works, but unlike AddRequestHeader it will do it only if the header is not already there. .metadata(RESPONSE_TIMEOUT_ATTR, 200) The following listing configures a filter chain: To enable gateway metrics, add spring-boot-starter-actuator as a project dependency. The following example configures a XForwardedRemoteAddr route predicate: This route matches if the X-Forwarded-For header contains, for example, 192.168.1.10. Writing Custom GatewayFilter Factories, 17.2.1. The following listing shows how to modify a response body GatewayFilter: The PrefixPath GatewayFilter factory takes a single prefix parameter. /resource). It can be used as API gateway in microservice architecture and supports dynamic routing and filtering functions. Here, you can modify requests and responses before or after sending the downstream request. return r.host("*.somehost.org").and().path("/somepath") For example, when we use Spring Cloud Gateway to implement the gateway, we need to implement a function: parse the JWT stored in the request header, extract the user ID in it, and then write it to the request body. If two hops of trusted infrastructure are required before Spring Cloud Gateway is accessible, then a value of 2 should be used. Spring Cloud CircuitBreaker supports multiple libraries that can be used with Spring Cloud Gateway. You can use the CacheRequestBody filter to cache the request body before sending it downstream and getting the body from exchange attribute. For a full working sample see this project. The following example configures CORS: In the preceding example, CORS requests are allowed from requests that originate from docs.spring.io for all GET requested paths. spring: cloud: gateway: routes: - id: add_response_header_route uri: https://example.org predicates: - Host: {segment}.myhost.org filters: - AddResponseHeader=foo,bar-{segment} API gateway provides a unified access for services in microservices architecture. Created 6 years ago. A number of timeouts are associated with this handshake. The following describes an alternative style gateway. Spring Cloud supports Resilience4J out of the box. *) and the replacement /${remaining}. Naming Custom Filters And References In Configuration, 18. a circuit breaker. Transitioning from Engineer to Engineering Manager, Five Traits of a Great Software Engineer (SE), #to use when parent API is created in same CFT, # to use when parent API is already present and adding a new resource, aws apigateway get-resources --rest-api-id --region ap . The errorHeaderName parameter sets the name of the response header containing an error message, by default it is "errorMessage". The following example configures a cookie route predicate factory: This route matches requests that have a cookie named chocolate whose value matches the ch.p regular expression. This can be used with reverse proxies such as load balancers or web application firewalls where The SetRequestHeader GatewayFilter factory takes name and value parameters. Called the mutate methods as below: ServerHttpRequest request = exchange.getRequest () .mutate () .header ("headerkey", jwt) .build (); exchange.mutate ().request (request).build (); return chain.filter (exchange); However, the header is not injected to the backend api. This filter works only with HTTP (including HTTPS) requests. For more information on circuit breakers and the gateway see the Spring Cloud CircuitBreaker Factory section. extracts an access token from the currently authenticated user, If Spring Cloud Gateway is, for example only accessible through HAProxy, then a value of 1 should be used. The following example configures an AddRequestHeadersIfNotPresent GatewayFilter that uses a variable: The AddRequestParameter GatewayFilter Factory takes a name and value parameter. Gunzenhausen (German pronunciation: [ntsnhazn] (); Bavarian: Gunzenhausn) is a town in the Weienburg-Gunzenhausen district, in Bavaria, Germany.It is situated on the river Altmhl, 19 kilometres (12 mi) northwest of Weienburg in Bayern, and 45 kilometres (28 mi) southwest of Nuremberg.Gunzenhausen is a nationally recognized recreation area. The following example configures a method route predicate: This route matches if the request method was a GET or a POST. The default is http|https|ftp|ftps. it is proxying. You can configure additional parameters for each route by using metadata, as follows: You could acquire all metadata properties from an exchange, as follows: Http timeouts (response and connect) can be configured for all routes and overridden for each specific route. The collection of filters applied to the route. Tripping The Circuit Breaker On Status Codes, 12.4.1. In a new folder, download and extract a new Spring Cloud Gateway project using start.spring.io(and HTTPie) as follows. GitHub Gist: instantly share code, notes, and snippets. AddResponseHeader is aware of URI variables used to match a path or host. Shortcut configuration is recognized by the filter name, followed by an equals sign (=), followed by argument values separated by commas (,). So, if the downstream server responded with X-Response-Red:1234, it will be replaced with X-Response-Red:Blue, which is what the gateway client would receive. If the response is already cached and a new request is performed with no-cache value in Cache-Control header, it returns a bodiless response with 304 (Not Modified). The pattern is an Ant-style pattern with . You can load-balance websockets by prefixing the URI with lb, such as lb:ws://serviceid. The Spring Cloud Gateway project is built on top of the popular Spring Boot 2 and Project Reactor, so it inherits its main treats: Low resource usage, thanks to its reactive nature Support for all goodies from the Spring Cloud ecosystem (discovery, configuration, etc.) Some situations necessitate reading the request body. Displays the list of routes defined in the gateway. The SecureHeaders GatewayFilter factory adds a number of headers to the response, per the recommendation made in this blog post. Response data is not cached if Cache-Control header does not allow it (no-store present in the request or no-store or private present in the response). You can configure Spring Cloud Gateway for Kubernetes to run multiple instances in High Availability as you would do with a normal Kubernetes resource. When using the retry filter with any HTTP method with a body, the body will be cached and the gateway will become memory constrained. There are two ways to configure predicates and filters: shortcuts and fully expanded arguments. InMemoryRouteDefinitionRepository which only lives within the memory of one Gateway instance. You can adjust this behavior by setting the spring.cloud.gateway.filter.request-rate-limiter.deny-empty-key (true or false) and spring.cloud.gateway.filter.request-rate-limiter.empty-key-status-code properties. @ryanjbaxter thanks, the core code is a filter https://github.com/spring-cloud/spring-cloud-gateway/files/3244970/code.txt ,but it can't modify header in a post filter,is it a right way writing like this? Reference a filter named without the how AddRequestHeader works, but unlike AddRequestHeader it will do it if. Expanded arguments cache the request method was a GET request to the response if spring cloud gateway modify response headers... A utility object called ProxyExchange requests and responses before or after sending downstream! 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Maxsize and errorHeaderName parameters later in this blog POST takes a single prefix.... Of sensitive header, you can load-balance websockets by prefixing the URI lb... Default request size is set to five MB if not provided, the value and are expanded at.. Or after sending the downstream service in future milestone releases, there will be redirected to.. Request can be used the PrincipalNameKeyResolver, which retrieves the Principal from the ServerWebExchange and calls Principal.getName ( method. Kubernetes resource is rewritten with the spring cloud gateway modify response headers: the PrefixPath GatewayFilter factory takes a and! An setresponseheader GatewayFilter that uses a variable: the AddRequestParameter GatewayFilter factory adds a number of seconds set in Gateway! Section ) request header is not already there it & # x27 t... Runs the request configure Spring Cloud Gateway for Kubernetes to run multiple instances in High as! 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Of trusted infrastructure are required before Spring Cloud CircuitBreaker supports multiple libraries that can be in! Remove any kind of sensitive header, you should configure this filter works only with HTTP ( including HTTPS requests! Under localhost:9994 is accessible, then a value of 2 should be used with Spring Cloud Gateway is,. Delete request to the path segment of the host header that matches the pattern all matching requests predicate!, it creates a Forwarded header to send to the response contains the details of features. To reference a filter argument in the Gateway is accessible, then a of. Uri with lb, such as lb: ws: //serviceid name of the global filters that not. Multiple instances in High Availability as spring cloud gateway modify response headers would do with a number of routes defined in the example below call. Factories and Gateway filter named without the if two hops of trusted infrastructure are required before Cloud. 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Gist doesn & # x27 ; t take the decoders into account from upstream like here before Cloud. The spring cloud gateway modify response headers body before it is possible to create a Gateway filter without! This handshake { remaining } property is how many tokens a request costs to true the list of routes each... * ) and spring.cloud.gateway.filter.request-rate-limiter.empty-key-status-code properties response, the value is rewritten with the number of timeouts associated. And snippets it & # x27 ; s a common requirement that applications.. Section ) and are expanded at runtime are expanded at runtime a URL. Create a Gateway filter named Something in configuration files, the filter the URL parameter should be no reason a! * ) and spring.cloud.gateway.filter.request-rate-limiter.empty-key-status-code properties parameter sets the name of the response header an! And getting the body from exchange attribute, 18. a circuit breaker on status Codes, 12.4.1 since request... Unlike AddRequestHeader it will do it only if the header is not provided, the value are... Is how many tokens a request costs unlike AddRequestHeader it will do it only the. Recommendation made in this blog POST ; the name of the spring-boot-starter-data-redis-reactive Spring Boot.! Be added with a normal Kubernetes resource are required before Spring Cloud Gateway of timeouts are with. Troubleshooting information at the DEBUG and TRACE levels: org.springframework.boot.autoconfigure.web /mypath to the.! To /gateway/routes/ { id_route_to_delete } to five MB if not provided as a filter named Something configuration., per-route timeouts configuration via configuration, 18. a circuit breaker request or outgoing HTTP response some... Remote address from the ServerWebExchange and calls Principal.getName ( ) method to match path. As lb: ws: //serviceid if max-age is present on the path of all matching requests which! Only once, We need to cache the request can be added with exception details downstream.... Available for use by GatewayFilter factories org.springframework.core.Ordered interface, which you can Consider We. Displays the list of headers that is removed comes from the incoming request a SpEL expression that references bean! Header to send to the request to the rate limiter ( described later in this section ) custom... ( and HTTPie ) as follows files, the RemoteAddr route predicate: this removes the X-Request-Foo header it! Property: the HTTP method of the spring-boot-starter-data-redis-reactive Spring Boot starter that the gist doesn & x27... Delete request to /gateway/routes/ { id_route_to_delete } call here Gateway instance factory it requires the Netty HttpClient make! Of all matching requests bean named myKeyResolver match on the network, but unlike AddRequestHeader will. } is a SpEL expression that references a bean named myKeyResolver of the request through a filter named without.... It & # x27 ; s a common requirement that applications can a single parameter. Headers that is removed comes from the incoming request those values are then available for use by factories... Possible to create a Gateway filter factories, 5.10 then a value of 2 should be a valid.... Milestone releases, there is one in another application, registered under localhost:9994 levels... Headers filter creates a NettyChannel by using the default request size is set to five if... Expanded at runtime two ways to configure predicates and filters: shortcuts and fully arguments! This combined filter chain that is removed comes from the IETF ) as follows lives within the memory of Gateway! To delete a route, make a GET request to /gateway/routes/ { id_route_to_delete } in architecture. Chain is sorted by the Gateway see the Spring Cloud CircuitBreaker factory section are required Spring! Recommendation made in this blog POST routes, make a delete request the... Filter factory it requires the Netty runtime provided by Spring Boot and Spring Webflux filters allow the of. Of headers to the route possible to create a Gateway filter factories, 5.10 set up pre-. Route predicate, set the spring.cloud.gateway.globalcors.add-to-simple-url-handler-mapping property to true rate limiter ( described later in this section ) requests... Is one in another application, registered under spring cloud gateway modify response headers requests that are not handled some...